Issue
Here is the issue.
The graph plots the demand for reserves, as a function of the interest rate on other short-term assets such as overnight federal funds, Libor, money market rates, and so on.
(Reserves are accounts that banks have at the Fed. The Fed sets the interest rates on such accounts.)
The lower horizontal line is the rate the Fed pays on reserves.
If the interest rate on other similar assets (overnight federal funds, Libor, repo rates) is above the interest rate on reserves, then banks should want to get rid of reserves. However, reserves are useful, as money is useful, so banks are willing to hold some even when they lose interest on reserves by doing so. The greater the interest costs -- the greater the difference between the rate banks can lend at and the rate they get on reserves -- the more they work hard to avoid holding reserves. At the end, there are legal and regulatory requirements to hold reserves.
In the flat zone, banks are satiated in reserves. Reserves don't have any marginal liquidity value. But banks are happy to hold arbitrary quantities as an asset so long as the interest on reserves is above or equal to what they can get elsewhere.
If banks can borrow at less than the interest on reserves, they would do so and demand infinite amounts. Therefore, competition among banks should drive those rates up to the interest on reserves. Similarly, if rates banks can lend at are higher than interest on reserves then banks should compete to lend, driving other rates down to the interest on reserves. Therefore, the Fed by setting the interest on reserves sets the overall level of overnight interest rates.
Questions
Here are the questions:
1) Where should the supply of reserves be? This is the biggest question the Fed is asking right now. The three vertical lines in the graph are three possibilities.
The Fed currently fixes the supply of reserves, which is referred to as the "size of the balance sheet," so the lines are vertical. The Fed raises the supply of reserves by buying assets such as treasuries or other assets, "printing money," i.e. creating reserves, in return for the assets. The balance sheet shows the assets (e.g. Treasuries) against liabilities (reserves and cash). Yes, the Fed is nothing more than an enormous money market fund, offering fixed value floating rate accounts which it backs by treasury and other securities.
There are two floor-system variants: abundant reserves, with the supply well to the right, and minimalist reserves, with the supply of reserves set to the smallest possible level, where the demand curve just hits the lower bound, "satiation" in reserves. The latter seems to be where the Fed is heading -- a minimal-reserves floor system.
In a "corridor system," the Fed has an upper and lower band for the market interest rates it wants to target. Historically this was the Federal funds rate, which is the rate at which banks lend reserves to each other overnight. It tries to place that interest in the middle of the band, by artfully putting the supply of reserves in the downward sloping component. This is how the Fed operated before 2008.
The rate at which the Fed is willing to lend reserves also provides an upper bound, which I'll get to in a minute.
2) If there is going to be a corridor, which rate should the Fed care about? The (justly) moribund federal funds rate? The overnight general collateral repo rate? Libor? One advantage of the abundant floor, is that the Fed can stay quiet about all this and let the market sort out just what kind of overnight lending it prefers.
3) If there is a band, how wide should the range between the upper and lower bound be? 1%? 0.5? 0.25%? 0.01%?
3) How free should lending and borrowing be? Who gets access to interest paying reserves, and how much interest do they get? Who can borrow reserves, and on what therms -- what collateral is acceptable, is it overnight or term borrowing, does such borrowing incur formal regulatory attention or informal "stigma"?
4) What assets should the Fed buy on the other side of the balance sheet, or accept as collateral if it lends reserves? Just short-term treasuries? (My favorite) The current mix of long term treasuries and mortgage-backed securities? Or, perhaps, follow the ECB and BOJ and buy corporate bonds and stocks, many countries debts, or lend newly created reserves to banks and count the loans as assets?
The motivations here are, I think, as much political as economic, and it's better to acknowledge that. (We should understand the Fed can't do that in writing, but we can!) Having touted QE as extraordinary accommodation the Fed is under big pressure to stop stimulating. It's too late to say that QE was mostly symbolic. Having seen the Fed buy all sorts of securities, congresspeople are coming up with dandy ideas for new things the Fed can "invest" in by printing money. Having paid banks about a quarter point more than they can get anywhere else, and indeed allowed a pleasant little arbitrage to go on, the Fed is under pressure to pay other investors the same. Congress is even more full of ideas for who the Fed should lend to, and how the Fed should use its expanded regulatory powers to channel credit here and deny credit there.
"Normalization" is a pretty meaningless economic term to me -- why is whatever the Fed was doing in 2007 "normal," why is it good? But "normalization" is a tremendously useful marketing banner. We're going back to "normal," so leave us alone with your bright ideas. Well, fine, but let us quietly go to a new normal that incorporates all the interesting things we've learned in the last 10 years.
My answer
My (radical as usual) answers:
I like the "floor" system, with abundant reserves. The great lesson of the last 10 years is, we can live the Friedman rule. We can have money that pays full interest, so that holding money has no opportunity cost, and this will not cause inflation. This is genuinely new knowledge. Liquidity is free! There is no need for people to waste time and effort on cash management. Liquidity is good for financial stability too: Banks holding huge reserves don't fail.
I go beyond the abundant floor: The Fed should not target the supply of reserves at all. The supply curve of reserves should be horizontal. The Fed should just say, "bring us your treasuries, and we'll give you reserves and pay the IOER rate." Or, "Bring us your reserves and you can have treasuries."
Why? Well, if you want to target a price, you offer to buy and sell freely at that price. If you want to target an interest rate, target an interest rate. We have seen limited arbitrage between reserves and other assets due to lack of competition in banking and Fed restrictions, who can hold reserves, and the fixed supply.
I see no economic or financial harm whatever from arbitrary expansion of the Fed's balance sheet, if the assets are all short-term Treasuries. Reserves are just overnight, electronically transferable government debt. If the banking system wants more overnight debt and less three week to six month debt, let them have what they want. I see no reason to artificially starve the economy of overnight debt. The Fed offers free exchange between cash and reserves; the government as a whole should offer free exchange between short term treasuries and overnight treasuries, i.e., reserves.
To accommodate the economy's desire for ample reserves, and the Fed's desire not to provide them, the Treasury should offer the same asset, and the Fed should encourage this and work with the Treasury to make it happen.
Specifically, the treasury should issue overnight, fixed-value ($1), floating-rate, electronically-transferable debt. Let's call it treasury electronic money. Legally, this is treasury debt that any individual or financial institution can hold, just as they can hold treasury bills or treasury coins. Functionally, these are interest-paying reserves. Like reserves, but not even like T bills, these can be bought or sold immediately: Owners can transfer their ownership of $1 worth of treasury money to someone else on the treasury website, and owners can sell $1 worth of treasury money and have the money wired (i.e. the treasury sends $1 of reserves to the owner's bank) instantly. (Details here.)
Given the Fed's resistance to narrow banking, and the potential of treasury electronic money to undercut bank's (subsidized) deposit financing, I suspect the Fed's first instinct would be to fight such an innovation. The Fed should overcome that instinct and welcome a solution to the problem of providing lots of liquid assets without the (genuine, below) downsides the Fed feels about a large balance sheet.
I agree with critics that the composition of the Fed's assets should return quickly to short-term treasuries only, and in my ideal world to just this treasury electronic money. That is mostly for political economy reasons outlined below. Other assets should be on the balance sheet in emergencies only.
If the Fed feels the need to buy long-term treasurys or take them as collateral, issuing reserves in return, because of a shortage of safe assets, that means the Treasury has not issued enough short-term liquid treasurys. There are simpler ways to fix that problem.
I agree with critics that the composition of the Fed's assets should return quickly to short-term treasuries only, and in my ideal world to just this treasury electronic money. That is mostly for political economy reasons outlined below. Other assets should be on the balance sheet in emergencies only.
If the Fed feels the need to buy long-term treasurys or take them as collateral, issuing reserves in return, because of a shortage of safe assets, that means the Treasury has not issued enough short-term liquid treasurys. There are simpler ways to fix that problem.
Other answers